1 .	If the radius of a cone is 21 cm, then find the difference of curved surface area and total surface area. (A) 441 π $cm^2$ (B) 1386 π $cm^2$ (C) 21 π $cm^2$ (D) cann't be determined
[ A ]    a [ B ]    b [ C ]    c [ D ]    d
Answer : Option A Explanation :
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